Preparation of Phase Pure Cuprate Superconductors via The Modification of Sol-Gel Method

• 발행기관: 한국응용과학기술학회 (구.한국유화학회)
• 저자명: Beom Shu Ahn
• 간행물 정보: 『한국응용과학기술학회지』한국유화학회지 제17권 제2호, 144~148쪽, 전체 5쪽
• 주제분류: 공학 > 화학공학
• 파일형태: PDF
• 발행일자: 2000.06.30

영문 초록

A modification of the sol-gel method to obtain phase pure superconducting oxides is described. The method starts from organic salts of yttrium, barium and copper, such as acetates, and avoids the sudden and uncontrollable decomposition of the organic fraction which occurs if nitrates are used as starting materials. The aqueous solution obtained with citric acid in an alkaline medium is concentrated under vacuum. The solid so prepared is decomposed at about 300℃ thus giving an oxide precursor containing well dispersed yttrium, barium and copper. Pyrolysis at 850 - 920℃ followed by oxygen annealing gives the superconducting orthorhombic 123 phase. The results of TGA/DTA of the precursor, as well as XRD, electrical and magnetic property measurements on the pyrolysis products are presented and discussed.

목차

Abstract

1. Introduction

2. Experimental

3. Results and Discussion

4. Conclusions

Acknowledgment

References

키워드

Cuprate superconductors Sol-Gel XRD Phase purity Electrical resistance